Plaster board



Nov. 17,1925- 1,561,635;

c. R. BlRbsEY PLASTER BOARD Film1 Jan, s, 1921 I I'HI'IIIIIIIIIIIIIII 1 I'. y i

I I I Patented Nov. 17, 1925.-

UNITED V'STATES 1,561,635 PATENT `OFFICE- CHARLES Bf. `BIBLDSEY, OF HINSDALE, ILLINOIS, ASSIGNOR T UNITED STA'IES GYP- SUM COMPANY, OF CHICAGO, ILLINOIS, A -(.'ORIIPOBIA'IION OF ILLINOIS.

A.PLASTIEK BOARD. v

Applicationv led J'anuary'', 1921. Serial No. 434,651.

To all whom it may concern.'

Be it known that I, CHARLES R.' BIRDSEY, a citizen of the United States, residing at Hinsdale, in the county of Du Page and State of Illinois, have invented certain new and useful Improvements in Plaster Board, of which the followingxi's a description.

My invention belongs to that general class 'of devices known as plaster board or the like, and relates particularly to an improved y board which will be simple, pleasing in ap- A pearance, convenient, durable, satisfactory and efficient, and which may be accurately and economically manufactured. The invention relates particularly lto a vtype of board in whichl the body. of plaster, plaster Paris or equivalent plasticmaterial is enclosed on one or both face sides, and is cnclosed on one or more edges, the edges conforming to the desired vspecification as to size and shapef Many other objects and advantages of the construction herein shown and described will be 'obvious to those skilled in the art from the disclosures herein given. The resent .invention was described and fi lustrated 'in my application Serial No. 348,941, filed January 2, 1920 which matured into Patent 1,358,508 on November 9, 1920. f

To this end -my invention consists in the novell construction, arrangement and combif nation ofparts herein shown and described, and more particularly pointed out in the claims.

characters indicate. like or corresponding parts,

Fi 1 is a4 sectional view ofi a portion of t e plaster board'-Iv embodying the in- 0 vention;

' Fig. 2 is a perspective view of a portion of the same board; and

Referring to the drawings, first to Figs.-

.55 the two covering sheets are bent or folded In the drawings, wherein,l like reference over at opposite edges, it being understood that one or both, or more, edges may be yenclosed so as to enclose the plastic material at the edges of the board. `Where the board is `manufactured by a continuous process and cut into desired lengths, only two opposite edges are enclosed, butthis is immaterial as the remaining edges may be enclosed i in any suitable manner. As shown, sheet 2 is folded over as at 4f, and sheet 3 is'folded over as indicated at 5, the edges being brought close together so that theyk substantially abut. While I have shown the two turned over portions 4 and psubst'antially of the same width, this is, ofh course, immaterial, as they may be varied in width if so desired.

Ordinarily I prefer to scorethe sheet as at 6 6 so thatthe same folds over evenly and gives an even'or perfect 'edge or corners, it being understood 'that a straight or inclined or other form of edge may be formed, this being a matter of preference.

The covering sheets at the sides and edgesare maintained in place, where a body of the type described is used, by the adhering of the covering sheets to the body.

` It will be noted that with' the construction shown, the edge is substantially completely i enclosed, and as before mentioned, the edges mayr be enclosed at one Ior both sides, it being `immaterial hou7 many edges are so enclosed. i Obviously, if the sheets are integral andl lapped over one edge, then only the opposite edge would need to be enclosed 1n the manner described. The resultingproduct has a straight, smooth, finished edge,

.at a perfect, desired angle, the board being uniform Ain width. The completed product has many advantages, including increased 'strength and durability, and an improved appearance. During shipping and handling, the edges enclosed are protected so that there is no'tendenc to break away thereat, and there is nol si ing out or powdering of the vbody at the enclosed edges. It will be noted that the construction shown in Fig. 3 is similar to the construction shown 1n F1 3 of the application referred to, except t at4v in this case the imbedded edge is brought tothe edge 11 rather than pro]ected 1nwardly.

Having thus described my mventlon 1t iS obvious that various immaterial mod1iications may be made in the same without departing the spirit of my invention;

-hence I do not Wish to be understood as lim- ,tioned.

What I claim as new and desire to secure by Letters Patent is:

l. A plaster board of the kind described comprising a body of suitable material, and cover sheets arrangedat each side thereof, said sheets' foldedbver the side edges of the board, the extreme edges of said sheets, terminating adjacent each other and the folded over sheet portions on each Side edge lying in the plane of that edge. 2. A plaster board of the kind described 'comprisingya body of suitable material, and

cover sheets arranged at each side thereof, said sheets folded over the side edges of the board, the extreme edges of said sheets abutting each other and the folded over sheet portions on each side edge lying in the plane of that edge. Y

3. A plaster boardjof the kind described comprising a body of suitable material, and cover sheets arranged at each side thereof,

vsaid sheets folded over the side edges; the

extreme edges of said sheets terminating short of each other. and the folded over sheet portions on each side edge lying in the plane of that edge. y

In testimony signed my name.

CHARLES R, BIRDSEY. i

whereof, I have hereunto 

